Jason Segel is onboard for How I Met Your Mother season 10, but regardless of the actor's enthusiasm, returning to the series is a bad idea. Director Pamela Fryman stated in an interview that Segel, who played the lovable Marshall Eriksen throughout the show's original run, is always the first name to respond positively to any talks of resurrecting HIMYM for season 10. This is understandable given the success of sequel series How I Met Your Father, which has been renewed for season 2. However, because of the way HIMYM ended, it's likely better for all involved to permanently shelve the idea of a reboot.
In 2014, when How I Met Your Mother’s controversial finale premiered, many longtime viewers were left feeling dissatisfied with the way the series ended. In the finale, much of the goodwill the show had earned over its 9-season run was essentially extinguished in one fell swoop. And, beyond the finale, the show had already been on the decline for several seasons. Because of this, it’s understandable that Segel would want to reboot HIMYM, perhaps in an attempt to undo the mistakes made by the show in its final years.
However, as other recently revamped series have shown, a reboot of HIMYM wouldn’t necessarily fix a show that had already run out of steam by its finale. In fact, HIMYM season 10 could run the risk of being just as controversial as the original series. If the reboot began featuring new characters meant to distract from past HIMYM mistakes (such as a lack of diversity) or lazy attempts at recognizing prior slip-ups, the series would amount to a misguided attempt at revitalizing love of the series, particularly as HIMYM cast member's cameos on How I Met Your Father are already working well for the franchise anyway.
As an example, if HIMYM couldn’t get the entire original cast for a reboot—similar to Sex and the City reboot And Just Like That—the series could run the risk of jamming in new characters like the fraught Che Diaz, which can occasionally feel like pandering. HIMYM was originally critiqued for featuring an all-white cast, a criticism that And Just Like That addressed as well to mixed results. Conversely, How I Met Your Father has already fixed this critique, with its inclusion of a more diverse central cast, meaning there's no need for HIMYM to try their hand at answering this critique with a reboot of their own.
HIMYM had already been on the decline for years prior to the series’ controversial finale. The show’s final season was criticized rightfully for taking place over the course of 72 hours, a device that felt at best gimmicky, and at worst, staid. Additionally, thanks to several flash-forwards and time skips, fans already know what to expect from the characters and their respective futures. How I Met Your Mother season 10 picking up after Ted and Tracy get together, for instance, creates problems of its own. Marshal and Lilly moving to Italy for a year, and Robin constantly traveling for work means that opportunities to bring all of HIMYM's characters back together again are few and far between.
Inevitably, though some of the original cast may be keen on revitalizing HIMYM, any reboot attempt would be met with intense scrutiny, and likely find itself meandering and retconning prior series mistakes. To make a sequel series work, writers and creators have to expand the world and continue the growth of the characters. However, it seems likely, given How I Met Your Mother’s past mistakes, that season 10 would only be an apologetic treatise, desperately bargaining with angry fans for some of their goodwill back.