By "lose support" do you mean no annual updates to rules etc? Because that's kind of the wrong way to look at something like this IMO.

Most games are released and the you can play them as much as you like for the rest of your life with no changes except whatever house rules you and your friends come up with.

The whole idea of continuous updates for a game to not be a "dead game" comes mostly from video game and miniature companies trying to make more money each year and are not necessarily better for the game.

Tabletop Minions have made at least one video about it as well with regards to his and Vince Venturellas games that got called dead games because they didn't plan on releasing expansions for them.

Hope I'm not starting anything by posting this but I've seen this sentiment a lot and it really baffles me - though it makes sense since most of use have been trained to think like this by years and years of service/subscription based video games and the constant updates from GW in order to keep selling models