It would take time, but the alternative is this sheet goes away. As it is, the last version we have is incomplete with Xanathar's Guide. There is another book coming out in a couple of months. If the sheet was changed to accept files instead of it all being built in, other people could make their own files, homebrew content, as well as future books. I would rather have a system I can still use in 2 months, as of now, when/if new classes get added, there is no way to add that content. And, if it is released without the content, we can still download it and use it. As it is now, the sheet is gone completely. To change it, it would be one last push and we could use it again, infinitely.
So yeah, more work to save it versus no work and all the work Forge did goes away.