Not true, but it will rise enough to drop the profitability WAY LOWER than the current "incredible" calculations indicate quite quickly once any of the 2'nd gen X11 miners (specifically the new Pinidea, the A5, or the D3) start shipping in quantity.
Like on Litecoin though, the rise will be limited some by availability of miners to buy - there just isn't enough foundry capacity available on the current 14/16nm node for small companies like Bitmain and Innosilicon and Bitfury and BW.COM etc to make as many miners as they WANT to.
It'll likely be quite a while before any of the 2'nd gen X11 miners become UNprofitable unless you have a very high electric rate.
The resale value on an ASIC miner will NOT go up over time, though it might show short "spikes" when coin prices spike, like the last 3 months period or so.
S9 never got to the point it was UNprofitable, though sales dropped some as the profitability dropped, prior to the large Bitcoin price rise of the last 4 months or so.
A lot of that was driven by the big jump RIGHT AFTER the S9 was released, when the Chinese exchanges were allowed to accept Yuan after a year-to-two-year prohibition - then Bitcoin price flattened out for several months, very slow climb with a lot of bouncing 'till the next big jump hit this spring.