Classic WoW was 32bit and at that time we were running Windows 2000 and Windows XP 32bit.
Now most run 64bit Windows 10. Also, if they want to support the Mac version. At that time it was Apple PowerPC hardware and now OSX runs on Intel x86 Hardware.
So it's not just booting up some old code and be done with it.
Classic WoW needs to be able to run on today's OS Windows 10 64bit and OSX x86 64bit.
Next to this is needs to support the latest Graphics cards and drivers.
Then there is also the new account system under Battle.net, that didn't exist at that time either, so the old game launcher and client needs to be updated to use Battle.net.
That is probably just the tip of the iceberg of the work that needs to be done.
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Now most run 64bit Windows 10. Also, if they want to support the Mac version. At that time it was Apple PowerPC hardware and now OSX runs on Intel x86 Hardware.
So it's not just booting up some old code and be done with it.
Classic WoW needs to be able to run on today's OS Windows 10 64bit and OSX x86 64bit.
Next to this is needs to support the latest Graphics cards and drivers.
Then there is also the new account system under Battle.net, that didn't exist at that time either, so the old game launcher and client needs to be updated to use Battle.net.
That is probably just the tip of the iceberg of the work that needs to be done.