You need to go into every game with at least 2 guys who can catch punts and preferably 2.5. Chung is our break in case of emergency .5, and he's been nicked up this year. Edelman is 2, and they are clearly not wanting him to do it if he doesn't have to.
So, unless there's someone on the team with a hidden skill set (maybe I'm forgetting someone), Olszewski has a good gig going if he keeps it up. Because cutting him means you need to have Edelman do it and move someone into the backup role that you can have faith in, in a windy or rainy game in November. I'm sure Bolden and Slater would give it a go if they had to but profootball reference says they've only returned kicks (and both less than 10 total).