Sounds as though your users have gotten used to using the slower pipe.
Two might be just fine. Keep your options open by buying the ability to get a third pipe in. So if the users suddenly see all this bandwidth, they might start getting sassy and slurp down shit, plugging in their own equipment and doing crazy crap. You might also start needing that much more bandwidth, start using O365, Sharepoint, and all kinds of cloud storage. You might get another site fired up, and those few users at the remote site will need to share ~13Mbps upstream with each other. Your also need to determine if you need HA at some point, adding another DSL pipe would let in some bit of redundancy.
If you are going like for like, yes, with your plan now it should be fine. But since these are usually two to three year contracts, start future proofing yourself now. Look longterm, but don't go bleeding edge.
As for a 100Mbps DSL loop, totally possible. AT&T's U-Verse Gigapower is VDSL2+, but the loop has to be super short, so lots of it is new construction areas with fiber to the VRAD and 1000' loops to the locations. CenturyLink is offering a 100Mbps DSL pipe over a pair bonded VDSL implementation, but I don't believe they are offering symmetrical loops.