Until the acceptance of connecting passengers at Gatwick increases significantly, it will remain an O&D airport, instead of a hub like Heathrow.
The presence of Easyjet and other ptp players at LGW is not, of itself, a barrier to the use of LGW as a hub.
As there is no realistic chance of expansion at LHR in the near future, LHR is not really a threat to LGW's expansion either, as new there are two main scenarios for new LH routes to/from London:
1) They go to LGW anyway - as with new routes to HAN, SGN, HKG, PEK, ICN and so on.
2) Slots get juggled and they go to LHR, meaning there is some demand still displaced to LGW.
Over time, there is more and more latent demand for connections to be provided - but LGW would not offer the range or the frequency that LHR does.
However, there are other players besides BA who
could offer connections, most notably BE, who are chummy both with Oneworld through their BA part parentage and with Skyteam through their arrangements with AF.
So it is not a question of
which airport is going to be the main hub, as that isn't on the agenda at the moment. It is a question of whether or not LGW
can act as a hub facility in
some way - and the answer is clearly yes.
PS - I managed to read the article, might be a browser / cookies issue but if they are going to play silly like that I'll just paste the whole thing in.