Yup, the solution is so obvious and staring everyone in the face. ECNL just runs the DA league, basically intact, for the next year. The DA teams each play a crossover game against the ECNL teams. They use the DA showcase venues and increase the number of showcases. No one needs to go through the turmoil of figuring out which several thousand ECNL players should be displaced by several thousand DA players, and where the displaced players should all land, in a crazy situation where no one in the country can even train or tryout in person for the next couple months, at best. Then, based on results, they merge everyone into two tiers of 70 or so teams with promotion and relegation (and some crossover play in leagues and showcases) the following year.