It's not hard at all, we multipath all traffic across our mesh, we have multiple 10gbps fiber uplinks, and we're bringing up our first 100gbps circuit later this year. Most sites have plenty of capacity and we always try to ensure we have 2-4 paths out of every site. Unlicensed 60ghz is super easy to reuse, we drop 20dB once we're more than 0.2deg off the site, and since we operate in rural mountainous areas, our spectrum at each host location ends up being sparkling clean. Our APs have a 30deg azi/cell width, and we can do up to ~30 attachments on each. Best of all, Wave gear has a backup radio - if I need to take down/upgrade an AP, nobody ever notices, the stations all roam to a nearby AP on a 5ghz backup, and can usually still get around 300-600mbps or so.