The port of Ramsgate is not now and has not been closed to Ro-Ro ferry operators. It is open and ready for business, it just does not have any customers who want to operate ferry services from its facilities. It is an utter fallacy to imply that the port of Ramsgate is closed, or has been closed at some point, by calling for it to be opened.
The Port of Ramsgate is OPEN already.
Just in case there is any doubt as to its status as 'OPEN' here is a link to their page as they try to attract customers.
http://www.portoframsgate.co.uk/our-port/about-the-port/
Ramsgate being open is not the issue anyway - open or closed it lacks the available water depth and berth lengths at all states of the tide to accommodate the vast majority of vessels currently deployed on the short sea cross channel routes and smaller vessels cannot operate profitably out of Ramsgate due to a number of reasons, longer sailing times and the price of the extra low sulphur fuel oil that they now have to burn to comply with IMO Sulphur Emission Control Area (Channel and North Sea) rules being just two of them.