I think both options will be around for a long time. 

The current trend seems to be towards RESTful applications etc and I expect MVC to gain in popularlity. However some projects are more suited for the existing webforms style whilst others will greatly benefit from MVC.

MVC is great and to learn the basics is not going to take long. Go through the tutorials on Scott Guthries blog (although some of the early stuff is out of date and syntax has changes)

MVC does have some disadvantages:

MVC does not use viewstate. This has positive (smaller pages, faster, cleaner model) and negative points. Although not impossible it is trickier to develop items such as controls that need to maintain state e.g. a paging datagrid etc 

Many companies already have an investment in existing webforms technologies

How long before ASP.NET MVC becomes widely used in industry?
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