Why do it in the origianl Shakespeare dialouge?

All that is as important as wanting to keep nazi Germany aryan, or we truly will have lost something important. Ideologically there is very little difference, other than the violence employed.
Any forced "tradition" that has no place in current times is just a way to block progress out of fear of change and of the different. There is nothing important to lose, everything is still there but it is not current anymore than gladiators.

Every classic has its place in history. We hold them in our present time intact, but their power is going to CHANGE no matter how hard we try to preserve their currency.
The beauty of the language of the wordcraft goes for almost all classics, not just Shakespeare, yet we should not be forced to learn hundred of old languages to appreciate them in a modern format.
That is why they are adapted.

I agree with you: it's important to study the classics. I also think we're years away from Shakespeare becoming as difficult to read as Middle or Old English. If you give a slight nudge, hear it spoken, and analyze it a bit, it opens up quite nicely. I think the problem is with teachers who don't understand it, who give up, who think it's dull and communicate that to their students (some of whom grow up to be English teachers, who are bored of the "dull" Shakespeare...)

The other big problem is that it's taught the same way as novels. It's theatre. It's supposed to be studied, yes, but also heard and seen and performed. Get students performing (just on-book - no need to do full productions) and trying to figure out the wants of their characters, and I think a LOT of Shakespeare would become alive for them.

I'm presently working my way through Sir Gawain and the Green Knight - the original poem - in Middle English. It's slow going, but honestly, it's not too hard. I started out needing to stop and re-read every line several times to discern meaning, but the more I read, the easier it is. Most of the time now I only need to look something up once or twice per verse. And you know what? It's really, really rewarding. The flavour of the older linguistic style, its metre and its feeling - it's a great experience. It feels like dipping my toes into the truth of the myth. So, to that extent, throwing something out because it's hard or difficult to understand is a quick way to mostly enjoying shallow things, never growing. Caving to this impulse to never try hard is a problem, especially in a school or learning environment. But even in a non-academic world, I think people are cheating themselves by giving up just because something's hard to understand.