Because they care about maintaining their voters far more than enticing non-voters. If you listen to legislators and their staff for example, the way they perceive it is that non-voters may as well not exist in their minds, but eroding voters get attention.
I hate to say it, but the only way I could see it happen is if both parties simultaneously see significant 3rd/4th party challengers acting as spoilers. In that situation, RCV would be the short term solution to remove the effect of spoiler votes. Basically the situation the UK is in right now with both the Lib Dems and Reform.
The bitter fact is that a winning candidate has no incentive to reform the voting system that put them in power.
Why would a dominant party want to give any competitor an advantage?
Because they care about maintaining their voters far more than enticing non-voters. If you listen to legislators and their staff for example, the way they perceive it is that non-voters may as well not exist in their minds, but eroding voters get attention.
I hate to say it, but the only way I could see it happen is if both parties simultaneously see significant 3rd/4th party challengers acting as spoilers. In that situation, RCV would be the short term solution to remove the effect of spoiler votes. Basically the situation the UK is in right now with both the Lib Dems and Reform.