Well, I have this lens, among others; it's quite good/fast f1.4, and is neither large, heavy, or expensive. 
http://www.voigtlander.com/cms/voigtlaender/voigtlaender_cms.nsf/id/pa_fdih7bhcwc.html
(and, for a bit more money, I also have this one --- still, very small size & light-weight, though not as fast.):
http://us.leica-camera.com/photography/m_system/lenses/2194.html
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BRJR ....(LOL, some of us are quite satisfied as Hobbyists ..)
http://www.voigtlander.com/cms/voigtlaender/voigtlaender_cms.nsf/id/pa_fdih7bhcwc.html
(and, for a bit more money, I also have this one --- still, very small size & light-weight, though not as fast.):
http://us.leica-camera.com/photography/m_system/lenses/2194.html
--
BRJR ....(LOL, some of us are quite satisfied as Hobbyists ..)
There are two aspects in DSLRs, not contained in the SLR abbreviation.
SLR = Optical Viewfinder through the lense -> which might be obsolete in the future - but we are talking decade(s), not 1-2 years here, where digital viewfinders or framing through the back screen will be "that" better.
The other two characteristics that make the DSLRs a "hit", are interchangeable lenses and image sensor size.
Why having a variety of lenses available for your camera body is easy to understand, while the advantages of an all-in-one compact P&S is also understandable.
What gives a clear edge to the SLR is the size:
bigger sensor -> bigger capturing area -> higher resolution and detail capture -> obvious performance gains even with "18-55 3.5-4.5s"...
Better handling with more intuitive ergonomics for advanced photography (the opposite of P&S) and P&S alike.
Better Lenses -> as larger size is more forgiving to material restrictions begin with.
Size leads to higher weight and costs too...but that's not going to change anytime soon. Also note that "good" P&S or "prosumer" cameras are always bigger and clunkier than pocket sized P&Ss.
Yes, compacts now have better sensors, but so do SLRs...and that will continue and always SLR-sized cameras will be better than compacts which in-turn be better than cellphone cameras.
But just as medium and large formats are still here -> tho vastly changed, DSLRs or "close to 35mm sensor sized interchangeable cameras" will continue to exist, no matter how better the P&S will be, and how negligible their performance advantages will be for the average user.