While I wouldn't avoid problems they can't solve, I would try to get the flavor with appropriate levels of difficulty.
I.e., if they have to go indoors, but your average security guard has 4-6 dice, the sniper doesn't need a sniper rifle to win.
If they have the right skills 1 or 2, give them locks they CAN pick with those skills, to encourage them to use them.
If they literally refuse to do anything but fire support, you either have to enjoy gming that, or else find something you all enjoy.
I.e., runs indoors, in tight spaces, et cetera.
Also: drone riggers should be wary of making army of drones, because, well, drones ain't cheap!
If it gets out of hand, you can always destroy a few.
I recommend avoiding rulesets they don't want to learn at first.
E.g. don't make a habit of hitting your drone rigger with top notch hackers swiping drones. Helpless is bad.
If you do, put the hacker somewhere the sniper can get to him, so the solution is within their skill set.
"Everytime your drones get near that rooftop, they shut down and crash. Hmmm."
Personally, I think a 2 person team can work fine, with a little world building and appropriately chosen missions, and SELECT NPCs. A hacker NPC whose clumsy, prone to draw attention to himself, and who needs to be on the front lines to be effective isn't just doing things for the characters, he's adding new objectives - protect and teach his sorry bum. :-).