Maybe - but I'm skeptical that he will largely be able to follow through with his promises. Many of the big issues we face aren't problems created by/solved by political leaders. For instance, we're not going to quickly turn around job loses in the US because we're fundamentally seeing a shift in the importance/balance of labor to capital. Low-skill manufacturing jobs are never coming back - and there isn't a ready pool of alternative ideas that previous presidents were just refusing to implement (or some nonsense). If a president could solve that problem it would already be done.

That said, what people think is true is - of course - whatever they can be convinced is true. Immigration really isn't/hasn't been a problem, so if the president can build an unnecessary wall and convince people that immigration isn't a problem anymore because of it then maybe we're boned.