It's an odd one. Extending Merseyrail past Helsby (e.g. to Warrington BQ) would be negative, as it would import WCML delays onto Merseyrail - it's for similar reasons that I don't think the line from Ormskirk should extend to Preston, but rather Burscough, to keep it self-contained, as Merseyrail's simple, self-contained nature is where most of its strength lies. But similarly putting Northern services onto Merseyrail (i.e. running to Hooton) would be negative, as that would import the delays a different way. Yet if you argued that Ellesmere Port shouldn't have been electrified but instead served by an hourly Manchester, it'd then not have had its direct Liverpool service. And said Manchester would clog up paths for a tiny level of usage as there's not much there! Portion working it off the Vic-Chester wouldn't work either as the layout at Helsby isn't right for that.
I think Merseyrail to Helsby on batteries is the best it is ever likely to get, to be honest. But even that is questionable, as anyone from the rest of the Wirral Line can just change at Chester for a far wider range of services.
In essence it exists for the oil terminal (who don't really use it) and the small villages of Ince and Elton (who don't really use it). It's kind-of hard to justify it existing at all.