The change in El Campello is no longer necessary. There is now a service from Alicante Mercado to Benidorm departing every half hour. Destinations beyond Benidorm still require a change in Benidorm, but FGV are working on this. The plan is to offer a direct service from Alicante to Altea, possibly opening later this year.
A restoration of the through service to Denia is not likely to happen in the next couple of years as plans to electrify this line have been shelved. However, the line may well be extended at the Denia end to connect to the RENFE service in Gandia (such a service existed until th mid 1970s, so progress is going full circle).
At the Alicante end, however, work is in progress on extending the tunnel from Mercado to the RENFE station. This will provide direct connections to the national rail system and especially the high speed line to Madrid that is now being built. In a further phase, the TRAM service will be extended to the El Altet airport, so there are definitely plenty of exiting developments to look forward to.