Oh, this isn't just a high level tactic. This is an every level tactic. Low level parties can be using this right away. How many low level creatures could survive a trip through a 50 foot radius Spike Growth? Or a Moon Beam, that's either 45 feet wide, or has a range of 1,000 feet or more? Yet...
Pre casting spells that have a longer duration, like Spirit Guardians, would be the smart move BEFORE an encounter. Also prolonging spells like Aura of Vitality out to an hour. Spending an additional spell slot for that is a trivial cost, and think of how many spell slots you're saving on...
My two bits. No, this will not go away, anymore than Silvery Barbs did. Yes, party composition will be based on this. I also think new builds will be created based on this, and that we will see new tactics that revolve around circle casting. After all, it only takes two people. If all you want...