Is it reproachable to be satisfied? On that note, I don't think wanting game series to continue forever, ad nauseam, is desirable. There's an incalculable value to closure.
Phantasy Star, for instance, ended on the fourth game, released in 1993, and was never really revived - Online is a separate series - which is something I have major respect for in having been done. The development team and fans got their closure, and naturally moved on - and the series was much better for it. It's eternalized, with a beginning and an end.
Much vitriol has been given to entertainment industries for rehashing, but the truth of the matter is that they're only supplying for a demand. For as a long as people don't think 'enough', they will puppet corpses around. Really loving something is knowing when to let it go - to live forever in your memory.
That all said, I still think Metroid has places to go - and I don't want that potential to be blown away by the breakneck production of new titles. The more different from each other that they are, while still being Metroid, the better - and the passage of time pays service to that.
Has Chrono Trigger+ gotten consistent updates? Remember it being quite unpolished back when I tried it out.