Yes the yakuza series has done pretty well (you have what like 6 games now three of which I've owned one of which is japan only sadly) and a movie. They can make shenmue a success.

Relese it with improved HD graphics. They either need to redo the dub and or offer the Japanese with subtitles. price it well so it can sell and offer a demo. Offer both games in full. Maybe offer the shenmue movie in some form. perhaps the soundtrack again? Some wallpaper/themes and other goodies and hyping it up to would be good ideas.

Here's hoping it sells well I know I will buy it maybe even several times to show support so we can have part 3!