We are not at a all time low in terms of node count actually, node count has increased after the launch of XT, and since then it has actually stabilized. I do expect to see a trend reversal with increased adoption as we are already partially seeing today.
Yes we are.
https://bitnodes.21.co/dashboard/?days=365
Individual cases such as the one of your friend don't really matter in the grand scheme of things. The concern is with the trend. Now the trend clearly shows that the total node count, whatever the reason is, has progressively declined from its historic heights despite a clear increase in Bitcoin adoption.