On the subject of winning the Grand Slam (for that is what was suggested), it’s certainly not ridiculous to suggest Murray could do it. He has advantages over the other three players who might have done it in the last decade or so.
Federer came close, but Nadal was always in the way at the French. No longer that problem. Nadal: just not unbeatable enough on the hardcourts and also always had a very full and tiring clay season. Djokovic: again the Nadal problem, and arguably last year he might have managed it if only he hadn’t been so massively successful everywhere else in the first six months.
So to do it, Murray would certainly need to focus on it as his primary goal. He would probably need to get “lucky” and get knocked out early at some of the clay Masters events, and probably skip either Canada or Cincinnatti. He would also need none of the up and comers to up and come, and he’d need Djokovic to stay below par for a whole year.
Won’t happen.