At this point I think in four years the PM of the UK will probably be Swinson. Corbyn has Labour in a death grip and won't leave until he's carried out, turning them into a fringe nuisance party. The Tories are unlikely to hold total power until then, so the LDs are likely to continue to rise until they become the opposition and eventual coalition leaders.
Oh yes, the same thing we've heard in the 1980s: Labour is done and the SDP-Liberal alliance will inevitably get to power.
Labour's never been in the vise grip of an unelectable cult leader who would rather see the party and country flounder than give up his little slice of power.
The LDs have rarely had a natural political talent as good as Swinson, either.