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Re: Installing Debian On A 2011 iMac

>> probably do not support the hardware anymore). As new versions of Mac
>> OS are no longer supported on this computer, would it be possible to
>> install Debian Linux as the default OS on this machine

Without a doubt.  Have you tried and encountered problems?
A trivial search for "install debian imac" leads to

>> (and would it be update able for a long time in the future)?

Not sure what's "long" for you, but I'm running Debian testing on my
2006 mac-mini and my 2003 Thinkpad X30.