The current organising team have taken the event to an exceptionally high standard, which is no doubt a significant undertaking.
There will come a point when the key folk involved wont want to do it any more at which point there is no guarantee that there will be people willing to step into their shoes.
If I were keen on riding LEL Id be doing everything to ride the one that's planned in 2022 and assume nothing about the LEL-after-next.
More generally, and very sadly, big cycling events with international fields (LEL, PBP and to a lesser extent Sem Fed) in their pre pandemic guises may be last to return post pandemic, if at all.