Ya, that was my point. I'm 28 and healthy. If you remove the mandate, a lot like me will not purchase insurance and cease driving costs down for the elderly.
Most would argue for these options anyway though.
Trump seems to understand the situation they are in, but I argue his fallback of letting the ACA implode to reflect poorly against Dems isn't the failsafe he argues. The uninformed voter will just apply the conditions to the current administration, plus the foaming mouth repeal Obamacare crowd will be naturally disgruntled.
The Dems are being childish though and it appears they'd rather play a political game then to compromise and help more people.