They want to split in lot of optional modules, it's just the beginning. IMO it's a good idea. For your problem, perhaps they should add a custom build/download tool like jQueryUI.
I think it's a great idea as well. Would like to see jqLite come out as well and be a separate project. Then those using jquery don't pay for jqLite, and even beter, for a quick landing page I'd be inclined to use jqLite naked for a nice tiny footprint.