I hope Trump's shock to both the major parties encourages them to reconsider the war for power they wage day and night. But I'm not going to hold my breath.
The only way that statement makes sense is if the person saying it would be negatively affected and/or Trump weren't affiliated with either party.
Clearly so. It's perhaps, within the party, a defeat for sone establishment figures in terms of relative internal influence, but clearly the absolute and total lock on all organs of federal power they've secured is a major victory for the party.
And it's not like the party establishment suffered major reverses, either. Had Trump won despite the Republicans losing the Senate or facing unexpectedly large loss of seats in the House, that might be a different story.