I agree. GTD is a wonderful way to plan that sort of thing, but I might not have emphasized enough that I am doing a "light-weight" GTD approach until I get my new system. I'm not throwing the baby with the bathwater, but I understand your concern.
My concern is regarding what is highlighted in bold. Your approach *may* be one of clearing up the old stuff to start on GTD - that is an issue because GTD can be used to clear up the old stuff.
And, the migration and clearing up old emails or databases is a project rather than a necessity to get out of the way "to start gtd".
I'm already pretty good at throwing things away in general, except for things at my computer because it does not take any physical space. Generally reducing my tolerance level for that has made my life easier.
That's what scares me right there. Use the control dimension of GTD to answer questions such as, is it actionable, does it need to be incubated, or is it just reference material nice to have?"
+ there's also the option of not having all your data in one place and losing precious data from years and years and investing into one platform only. Personally, I get bored with the same software over and over again so it is nice to have different softwares/places to go online for different things. As much evernote wants to be my digital storage place, my file folders in "documents" are going to be one step ahead of evernote.
Many people are sceptical about cloud hosting, and I agree especially concerning with free solutions. However this is an issue no matter if you host things yourself or not. Apple has a better backup plan than I do and more experience. Things that are extremely important will be backed up in more than one place, but few things are extremely important to me in that way.
I love sticking with programs I know, knowing the ins and outs of it. Before there was a lust to try out new things whereas now it is a hassle, I got other things I'd rather spend my time on.
After my "light-weight" GTD system I want to have a fully synchronized system, which is why I am doing what I am. Full synchronization is extremely annoying the more applications and vendors you get software or hosting from. The light weight approach already gives me that synchronization actually (except physical folders that I don't bring everywhere). The issue is workload whereas the current system won't suffice if I try too many projects at once.
Perfection is continuous improvement of life quality.