I might consider requesting a refund if an Epic Games account is required for old Steam players. I absolutely despise what Epic is doing in regard to exclusivities in general and have no wish to support it in any manner.
Other than that, I'm OK with the free-to-play move.
As of right now it seems that account linking is optional and would only be used to benefit from cross platform progression. I don't think they can really afford the massive amount of backlash if they required an EGS account.
Certainly seems that way, which is nice. I'm still not a fan of removing the game from Steam (for new players), but since it doesn't affect me, I can bear it (well, I probably don't have a choice, besides not playing a game I've paid for). That said, I can totally see both Epic and Rocket League being able to take the backlash if they forced an Epic Games account. My impression is that in these cases, most of the backlash usually comes from a very vocal minority which rarely has a chance to actually do much.