Outside of that awful 1-4 start to the season, Cleveland are playing over .700 ball when LeBron plays. And it takes more than 3 months to create a functional team even from a superstar roster.
I agree that Love's drop-off in production has been worrisome, but I'd bet this team:
PG: Irving, Dellavedova
SG: Shumpert, Smith
SF: LeBron, Miller, Harris
PF: Love, Thompson, Marion
C: Mozgov
is playing pretty good ball come April. Maybe not championship caliber, but not as far off as they've looked so far.
There are going to be continued defensive questions, of course, and long-term I wouldn't bet against Love getting traded for a more defensive-minded 4 (not an outright specialist, just someone who is more of a presence on that side of the court who still has range. Like Kentan Facey!). But this team wouldn't be better with Wiggins instead of Love right now, and probably not two years from now either.