Here's a copy of an email from AheadTek who is the US distributor for Otari.
So, if you want a brand spankin new 5050, this is probably your last chance.
"Production of the MX5050 has stopped with the last units received at AheadTeK earlier this year. AheadTeK has stock of 6 pcs here in San Jose. At this point, the availability of future units will require at a minimum the re-layout of boards to changeover from thru-hole components to surface mount. Unfortunately, it appears that Otari will NOT undertake this task. The units in our stock are configured as 2-Channel, 2-Track record and play capable along with the "-P" option, a 2-Channel, 4-Track play head. We took this approach as most of our customers have large libraries containing both 2-Track & 4-Track recordings and they are most interested in play back only for the purpose of transferring content from analog to digital. The unit price is USD $8300.00 each and includes freight within North America. The product warranty is for a period of one-year. Spares will be available for some time to come."