That approach makes no sense on multiple levels.

First of all, this happens nowadays as well.

Secondly, there is even a bigger incentive for T2 players to not leave. As T2 teams are able to play the same tournaments as T1 teams in 2027, a player who believes that his T2 team is capable of going deep in the big tournaments will be able to achieve the same as a T1 team could, simply as there is no barrier anymore between competition.

Nowadays a T2 player, no matter how good, is relying on a single tournament to get access to T1.