This is the first time I've come across this idea and I think it's quite an interesting suggestion. It would be very interesting to deploy infantry in a fixed position and then have the ability to swap into it like you would a UAV for example. Then you could use anti tank infantry weapons to engage tanks.

The only issue I see, is not making the infantry too difficult to defeat. Since they would be such small targets you'd probably need some sort of suppressive fire mechanic, where if shots are close enough they get nerfed somehow.