Reading a bit about this, here are some interesting quotes from various sources.
1. "We’re not likely to see an impeachment anytime soon, for the same reasons that the Republicans were unable to stop Trump from winning the nomination: Trump has consolidated the GOP base as his own personality cult, thereby cowing Republican officeholders."
2. "There’s also the matter that, for Republicans — particularly, those whose seats are not a sure thing — impeaching Donald Trump could be tantamount to career suicide. Voters who cast their votes for Trump aren’t likely to take lightly any attempts by their representatives to impeach him."
3. “Many elected Republicans, perhaps most, consider Trump to be a threat to their brand and priorities. They worry that Trump is unhinged. (Who, apart from Trump himself, doesn’t?) To see Trump disappear and leave things to Mike Pence, a lockstep party man with all of Trump’s traditional rightist views and none of Trump’s eccentricities or heresies, would be a dream-come-true for Paul Ryan and Mitch McConnell.”
4. "The Republican Party establishment, its public pre-election misgivings and hand-wringing to the contrary, has fallen in love with Trump. The GOP leadership will overlook any transgressions to keep him in office for one simple reason—he’s their ticket to power, and power is all that matters."
5. "Ladbrokes the bookmaker has just slashed the odds on the president-elect leaving early due to being impeached or having to resign – before he’s even been sworn in as the country’s 45th president. The bookies opened the market at 3-1, before cutting it to 5-2 and, eventually, again down to 9-4, after a massive flurry of bets that Trump wouldn’t finish the term."
My summary: As long as his base sticks with Trump, he is safe. But in the insider game Washington is, the skids toward Trump's impeachment are already greased. Trump has few long-time political friends. If his actions or declining popularity threaten the power of the House and Senate seat holders, there is little reason for them to not impeach.
The central question is, how long will Trump's base continue to support Trump, and what new supporters, if any, will rise for his benefit?
Odds makers are increasingly looking for Trump to be impeached, but what do they know?