I think nobody wants to see a level 200 modern storm.
For those who don't know, this is the way most Japanese gatcha-style card-collecting games work (Rage of Bahamut, Reign of Dragons, Blood Brothers, etc.).
It's been suggested before but I doubt the devs would ever implement this. There are temporary event boosts to buff characters.
If D3P ever wants there to be a higher level Venom, they'll just add another version (Venom Classic or Venom Modern or whatever). If that new version is a decently powerful card with rarity of 2-star or higher, D3P will be able to put it in limited edition heroic tokens, use it to encourage some players to play more or spend more, etc. etc. Just like they've been doing with every new character they've introduced so far.