I'm struggling to make the connection here.
I am saying games that don't get patched or supported don't have a long term future in today's environment. Yeah MVC3 did get a couple of patches and an expansion but as soon as the well dried out the interest waned (when interest was really high with these things in play). MVC3 is sort of a game that was half way in between the Melee/MVC2 era of basically no post-release support and the current lots of post release support in fighting games which is why it has stayed afloat for 5+ years.
That said, post release content/support is not enough to keep afloat a game that is genuinely bad or poorly received. A game has to be both received well and get good support for it to be viable in the long term. With the advent of MOBAs, many players simply expect fast balance changes as the NORM.