The unconfirmed transaction pool is getting bigger and confirmations much slower than about one year ago. It is not "broken" now, but will be soon if we don't do anything.
Do you have stats on that, or is it anecdotal?
The pool of unconfirmed transactions does not seem to get bigger, at least not on my node (unmodded 0.10.0). They probably mixed it up with the UTXO set -> https://bitcointalk.org/index.php?topic=1055594.0
