Well you can reverse the reasoning, if you want to participate in multiple divisions , you must have 4-5 cards
Something that one can't rule out in open competitions is that if you want to win you will always need the top card.
The way I look at it anyone can chime in now, besides the Titan and RTX owners ( they have Div 1 to go for)
Don't forget the CPU limitation might be a bottleneck on some benches, also some benches require good old XP to be efficient,.. not everybody has an ACPI compliant bios,...