Im really confused here and I dont know if this is me or you, so I will just put this out there.
My understanding is that in order to create a SigWit transaction you pay to a SegWit address first. Thus its always the receiving party that deceides whether or not they want to use SegWit or not. If I create a "anyone can spend" address that is not SegWit, its my own fault that literally anyone can spend my funds as soon as someone else paid me. SegWit would introduce a new address type[1] to clearify on the highest level whats going on. So if I just dont upgrade, I keep using the same old version 1 addresses and nothing is going wrong, except that I might have to pay more in fees when I spend the coins.
[1] not sure which prefix though, 1, 2, 3, 5 are used, so maybe 4? or S for SegWit?