Big mistake, IMO.
You think so?
I think it's smart politics. He can criticize Obama's bill, while blaming Democrats for refusing to fix it. Meanwhile, he doesn't have to get into the details of solving the problem, which will ultimately leave some constituency upset.
Campaigning against Obamacare and the Democrats has been a winning strategy. It was only in 2018 -- when Trump couldn't blame Democrats, because Republicans controlled everything -- that it was a losing issue.
I think it's smart politics to secure his base but if Trump is to win, he needs one of two things to happen.
1. He attracts more of moderate America than he did last election or
2. Hope the Democratic base is turned off of their candidate again and doesn't go to the polls.
I happen to think the Dems will come to the polls in this election to support their own. I think a lot of people on the left have learned their lesson that not voting because you don't like your candidate can be a giant mistake.
So since option 2 isn't available, Trump isn't doing himself any favors with moderate America by not coming up with an alternative solution.
2016 was 2016. Times have changed. The mid terms set the tone that healthcare and it's costs are what America is most concerned with. Republicans lost 40 seats in the House based on Healthcare.
I think it will be a mistake just to continue to criticize Obamacare without giving an alternative for the 10th and 11th straight year. Sure Republicans who have already decided they are voting again for Trump will eat up the "Repeal and Replace" rhetoric but not addressing this issue will severely hurt Trump with undecideds and or blue collar voters that went his way in 2016 but could go Dem due to unfulfilled promises to them and because their health insurance still sucks and is expensive