some places can't handle it, but many places can, and many places that can't can be upgraded. The largest problems would be buried infrastructure, and high density areas. If a hotel had 200 rooms, then 10% at 100A would be 2000A extra, and so they would need an extra 480kVA supplied to them. That is quite a bit, and probably not included in the headroom they had spec'd when building. Now a typical residential transformer, that feeds 4 or whatever houses, probably wouldn't even need an upgrade. Most new construction in my area is 200A. I also think that it will be gradual enough that they can do these things slowly as long as the wizzkids in government don't make gas $5 while subsidizing electrical.