I don’t want to be dismissive of the idea, but if you don’t like playing against asset heavy decks, why not just ask your opponent not to play one?
Changing fundamental rules of the game will probably fix some problems but then open up new issues. When other players propose things like adding incremental cost to making new remote servers, it doesn’t account for the fact that assets weren’t designed with this limitation in mind and rez/trash costs would be way different in a world with this added cost to create additional servers.
Even simply limiting a deck to a specific number of assets doesn’t really make it less prone to abuse, you could probably still make a mildly effective prison deck with 12 assets (3 Bio-Ethics, 3 Hostile Infrastructure, and some number of Chairman Hiro, Genetics Pavillion, Whampoa, Jackson, Museum, and/or Ronin). You’d just end up switching out a lot of the asset econ for operations, but you could still assemble a pretty degenerate board if you’re playing IG for example.
I’m not trying to be one of those players saying “git gud” and to just learn to deal with asset spam, but it seems a lot easier to just communicate with your opponent beforehand about the game you’d like to play, even with something as simple as a lobby title in Jinteki.net stating, “Please, No Asset Spam” or similar. In my experience most players will be respectful of this sort of thing.
Generally speaking, alternative formats in this game have been slow to stick, and even the official alternate format, Cache Refresh, still has a pretty microscopic player base compared to the standard format. Trying to make an entirely new format just to avoid playing against asset spam seems a lot more difficult than simply trying to find an opponent who is willing to play a non-horizontal deck.