Bitcoin Core 0.13 How many addresses it can **effectively** manage?
Try it yourself. In Tools, Debug Console, try getnewaddress. Create as many as you want. See if your wallet performance changes. wallet.dat size will grow, but I can't 4MB vs 32MB has made much of a difference. 

DASH wallet when it generates 1,000 addresses at a time for its PrivateSend feature, I can't notice any difference in performance.

"Effectively" manage is really seeking an opinion where the system components the node is running on will tell you what it can handle "effectively".