If I buy a HDTV convertor box that is coming out, I won't need a Dish HD receiver or HDTV?

We know analog signals are going out and digital signals are coming in next year but many of us cannot afford these fancy HDTV stuff. The new stuff is pretty neat but will that HDTV convertor box be the answer?
Update: I do get Dish Network signals for just Dish Family 100 only on my current receiver. I get my local channels off rabbit ears.
Update 2: Dish Network charges $6 an month for Digital signals and also charges more for local channels.
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