Sure they can, in fact, any nodes that don't upgrade to a segwit friendly version will consider pure segwit txs to be an altcoin.
That would not make much sense. Please provide a source using the terminology "pure segwit txs" equal "an altcoin".
Check your premises, running the qt client used to be the most common way to interact with the network, now it's not. SPV type interaction is well developed and widespread at this point.
Exactly who was talking about SPV? Nobody. So you're not denying that the resource usage has increased and thus the number of nodes keep going down.
Incoherent non sequitur.
Sorry, failed attempts at spamming can be easily identified.
You strongly favor a centrally planned economy, which is a position, just not one I agree with.
Not necessarily, I favor the best proposals, and BU is certainly anything but the best proposal.