The 17th Amendment removed the primary watchdog, the primary check on the growth of the Federal Government, by making Senators responsible to the people, and not the States. If the Senate didn't have to worry about reelection by the people, we never would have had Obamacare in the first place. Absent repeal of the 17th, we are stuck in a death spiral, because systemically, it is impossible to stop entitlements and therefore impossible to stop our slow march to economic collapse. The goal is European socialist utopia...but we won't have a United States to defend us for free while we grow our entitlements. Trump was a nice thought...we needed something radical. But, he will likely not be enough.
Trump will have to start working on primary challenges now, if he is to succeed. He will essentially have to develop a new party within the GOP.