This is slightly worrying (link below.)
http://news.bbc.co.uk/1/hi/england/norfolk/5332622.stm

Here is how the Eastern Regional Planning Assessment views the group of lines of which Norwich-Lowestoft forms part (link below.)
http://www.dft.gov.uk/stellent/groups/dft_railways/documents/downloadable/dft_railways_611208.pdf

"The key issues identified are as follows:

The combination of relatively low frequencies and slow journey times leading to limited competitiveness of rail versus car and bus.

The routes are heavily reliant on subsidy, with low passenger volumes and revenues compared to costs.

Performance problems. Existing track layouts with long single-track sections can cause performance problems in the event of service perturbation.

Relatively unattractive rolling stock."

The Norwich - Lowestoft line , interestingly , is on the "the least-used lines in Britain." list contained in the link below (as are the rest of the lines in the area.)
http://www.savethetrain.org.uk/forum/index.php?topic=420.msg1242#msg1242

Also in this section of the Eastern RPA :

"Some further incremental improvements to services in support of regional planning objectives are worth further investigation. But it is unlikely that any new rail lines will be justifiable over the RPA timescale. The East West Rail scheme west of Bedford (although it largely is outside the geographic scope of this RPA) is one exception that, and subject to business case and funding, may be justified. East of Bedford, the East West Rail scheme is unlikely to be justified until beyond the timescale of the RPA. Therefore, for those regional links not served by rail, it will be necessary to look to improve the public transport offer in other ways, for example by investment in the inter-urban coach network."

"The East Anglia rural routes are affected by, and will be a factor in the delivery of the regional planning objective to regenerate the Norfolk coastal towns, including Great Yarmouth, Lowestoft and Cromer. On this basis, the key recommendation is to roll out Community Rail Development measures, with the aim of developing community participation, growing patronage and avoiding unnecessary costs. Opportunities to enhance service quality through improving timetable robustness, better integration with other modes at stations, and taking advantage of rolling stock refurbishment programmes to improve on-train service quality, should all be looked at as part of the overall community rail strategy for each route."

Nope , Im afraid that I dont like the look of this. I hope that there are no usage surveys planned (see links below.)
http://www.savethetrain.org.uk/reason6.html
http://www.savethetrain.org.uk/melkshamrailway/138_Lies_damned_lies_and_statistics.html