Mines to me have always meant to be dangerous in a different way: It's not that an individual mine will kill you (or the enemy). It's that there's ALOT of them. Usually blocking a path entirely.
This also affects player mines, and is the reason why I'd be against this change. The current implementation of player mines is pretty much done right, as I see it. You can do incredible damage with them.... but it takes time to set them up, and you have to choose the right places to do so, to get your intended target (usually a very high shielded bot) to run over many of them.
Change them up, and they'll be too strong. Or too irritating, in the case of enemy mines.
That being said, if you're playing on Misery, alot of the time you have little shielding to work with in the first place...