For Samsung, bottom line is that with all the commentary here and elsewhere of folks insisting they will keep the device regardless, they've little choice but to force an update to ensure the unit is disabled. Sure it will upset some owners and may lose them a few customers, but it is the right thing for them to do given the situation. What the folks shouting about keeping them they aren't seeming to care about the risk they will be placing other innocent parties under.
Sure I liked the 7 overall, only -ve for me was the edge glass, I've been in since the original note-1 came out. Mine is sat in its box waiting to be shipped back and I've switched to SIM only and reverted back to the note-3 until something better than current offerings are available. For me it makes no sense at all to hold onto the 7 even if they were not actively disabled by an update/IMEI block. No way am I prepared to take the risk of it failing while I am driving/travelling, am with my family/friends or at work, thereby putting other lives at risk.
Bit like driving drunk really, sure you may be ok and get home safely 98% of the time, but that one time when you don't, how many others got hurt and who's fault was it, the maker of the alcohol, the publican who served you, or you yourself for exercising poor judgement?
If you do continue to keep the device and go the custom ROM route to try to evade disable measures, you are fully and personally liable for whatever transpires thereafter. Can you really afford to compensate an airline for the loss of an aircraft? All the families for their loss? The cost of search and recovery operations?
Bear in mind too that just being there with a note-7 may lead to being implicated even if the device was not the initial cause, just because it's a known hazard and you hadn't returned it...