At what speed is it clever to mine solo?
Approximately 1/2000 of the total network speed or ~12TH right now.
"Stratum from pool 0 requested work update" i see that very often, what is it please?
'I have some new transactions for the same block - update your work'
At this pace of growing difficulty (+20% every 12 days seems to be exponential) so soon no one will ever mine, so how Bitcoin network will keep on.
If no one mines the difficulty will go down. The network will keep on, because it will always seek for a balance