I don't want to poop on anyone's party, but if JT came with a pipeline in one hand and no buyback/no new gun law/scrapping C-71 in the other, pretty much all of alberta would choose the pipeline. Of course a few "no comprise" would choose neither.
As for western alienation, what exactly can JT do about it? Think about it for a second, what would make you vote liberal in the next election? For most people in Alberta/SK, the answer is simple: nothing. God could come down from heaven to tell you to vote liberal and you would change religion. Even if JT builds a golden pipeline and give everyone in the west a BJ, he will still not win a single riding in the 2021 election. So why bother? Electorally speaking, why lose 100 votes to the greens and the dippers on the left to gain (maybe)1 on the right? That would equal a net loss of ridings.
Actually, JT's only chance at taking a few seats in the west is the emergence of an actual federal wexit party. That party would take vote from the PCC, and the PCC only, so liberal candidates would stand a chance to get through, a bit like how Notley got through when the wildrose and the Alberta conservatives divided the votes.
On the other hand, if the PCC made some modifications to its platform to get into 2019, it might lose a few votes in AB and SK, which would be inconsequential riding-wise, but win a lot more in the urban and suburbians areas int the GTA. Those changes would be:
1-Become pro-choice. And I'm not talking about some BS position like "we're not gonna talk about it" and then try every crap move in the book (like, for example, taking away funding from pro-choice organisation in thrid-world countries). I'm talking about taking an official pro-choice position in the part status;
2-Same thing about ### marriage;
3-Have an actual position on climate change. Nobody outside of the oil patch accept that global warming is a made-up story to frighten children. Denying scientific consensus is electorally destructive, at least in Canada.
Doing that wouldn't mean an easy landslide victory in 2021, but it would be the first step on a path to victory. Some urban and suburban ridings were close calls, and in those ridings, having social positions that pre-date the internet is about as destructive as spraying the candidate with voter-deterrent bodyspray. Of course, the heavily english-speaking ridings of Montreal and the pot-smoking brigade of Vancouver will keep voting liberal (or ndp/green), there's nothing to do about that. But the goal is the suburbian areas around those metropolitan areas.