I have c3-4 deciccation w broad posterior disc bulge (3.4mm) causing effacement of CSF space& moderate neural foraminal narrowing. Will I need fusion?

Depends on symptoms. We do not do surgery based only on films. If you have symptoms that are attributable to findings on films, then surgery should be considered. And even then conservative care can often alleviate the symptoms so that you do not need fusion.