The accusations in the document that are most damning are the ties back to Russian government and financial interests. I get the feeling that the golden shower stuff is in the document specifically to incite a social media frenzy and insure the whole document gets published, shared and dissected by media outlets and critics world wide. The details of that particular segment, down to the slight against the Obamas, are tailor made to insure the document gets maximum visibility so the rest of it cannot be ignored.
And oh man, is the rest of it damning. As others have said, given everything we already know about the Trump family's and cabinet's ties back to Russia, the information in the document is essentially the bow on the package of "Trump in Russia's pocket". Even if the document's accusations can't be immediately verified, the mere fact that they exist and that the intelligence community of the United States is taking them seriously means that every two-bit journalist looking for a Pulitzer will be out there digging and digging and digging...and it won't take long to prove the boring, non-prostitute containing parts of the document as true.
When that happens, not even his rural American base is going to be able to save Trump from impeachment. A sitting United States President simply cannot have the cloud of possible control by a foreign regime hanging over his head. He will be asked to resign. He will decline in the most explosive and ridiculous manner possible of course, and then the impeachment circus will begin. How long until all those spineless GOP sycophants turn on him? Will McCain, Kasich and other moderate GOP leaders who have been anti-Trump be able to reign the party in at that point, or will it be a Tea Party free-for-all with Mike Pence leading the charge?
I find it ironic and more than a little suspicious that this all comes to light in the days prior to the inauguration in the same manner the Comey FBI "reopened" investigation into Clinton did in the days leading up to the election. It's almost as if someone is using the agencies of government to influence the outcomes of elections with an end game of putting their preferred candidate in power (hint, it's not Russia).