Currently as things stand, the v2.1 portfolio page still states that v2.1 LPs are entitled to 100% ILP & that the LPs positions have not incurred any IL.
Users in v2.1 believe that by staying in V2.1, they have been entirely unaffected by the current state of affairs, and that porting over to V3 will result in an immediate loss from their position. This is not the case.
Having users port over from v2.1 to v3 will provide an immediate improvement to the current deficit and what is now a somewhat large problem, will turn into a significantly smaller, much easier problem to tackle.
Approximately a week ago, in the WBTC pool, my IL within a span of 24 hours reduced from 65% down to 50% due to a small number of users porting their positions over. Therefor I am suggesting that having every user together on the same page should be one of the first, if not THE first implementation the developers resolve.
If users from v2.1 have a more clear understanding of the current status of their portfolios, then this may encourage them to join v3