So people would hate having an Enterprise that actually resembles what was in Star Trek?
It does resemble the ship from the original Star Trek.
I assume by "resemble" you meant "looks absolutely identical to". In which case, yeah. People probably wouldn't be too thrilled with it. Remember this isn't the first time the original had to be changed to look good on the big screen. If it was dated in '79...
Please explain why Star Trek must be completely disregarded in order to create something that appeals to general audiences.
Because the Star Trek you're referring to has been tainted by a long string of products that could charitably be called disasters in terms of their popularity and profitability, and the most recent Star Trek that was any good is now over a decade old.