Quite possibly, yes. A few Sprinters per day is a drop in the ocean compared to the amount of car journeys which start from, finish at or pass through Spalding. A significant proportion of these journeys would be impossible to carry out by rail, at the very least without a major programme to re-open routes closed last century. Even then it would still be a drop in the ocean.
Lincolnshire is very car-oriented, the only vaguely significant rail flows are freight to/from Immingham, TPE’s Cleethorpes route (but still a fairly minor part of TPE as a whole), and perhaps some travel to/from Lincoln. Even Skegness is insignificant in the grand scheme of things.
If we consider that the lie of the land in Lincolnshire makes crossing to bridge conversions disproportionately difficult, these factors must surely combine to make the cost/benefit ratio challenging. Add in some moans about property demolition, and it seems fairly clear status quo will prevail.
Somewhere like Spalding is your classic town which serves as a focal point for a large rural area, for which car is the only viable means of transport. I suppose there might be the odd once-a-week bus service for those who really can’t use a car. Rail is no use for any of these people as either (1) their line will have long closed, (2) their local station will have long closed even if the line is still open, or (3) they never had a railway in the first place. Even on the line which is still open, there are numerous closed stations either side of Spalding, meanwhile there’s no fewer than four closed routes.