It's not necessary for Salman Khan to switch to comedies, all he needs to do is to start taking age appropriate roles with a gripping storyline from any good director. He has potential enough to do more movies like Bajrangi Bhaijaan, even in Tere Naam movie during his earlier days, he did a great job. Probably every time when he chose scripts like that where he actually 'acted' and showed his skills, he most likely expected that he would get awards like Filmfare for those performances, so in the end he became demotivated every time and now keeps deluding himself thinking that audience will accept him the most only if he keeps doing these actions and Masala films.
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