When Mick Jagger (Stones) or Eric Clapton had already stopped 41-42 years to rock or bluesen and only a mixture of country and folk and soft rock elements have played, then this would certainly have a lot of people disappointed. Therefore, I can understand here all Dire Straits fans, have the desire for a slightly faster song. Classic rock songs are just more popular than a mixture of country and folk and bar music.
When Mark with Beryl already a song in the style of Dire Straits writes, then he could have equal invite his old friend John. John plays the old Dire Straits songs with full enthusiasm. A look Johns Illsleys awesome dynamic bass playing on 'Where do you think you're going "Hengelo 2015' from minute 3:30 on, then you will know immediately what is missing some pieces of Marks.
One should not forget that the music of Dire Straits had highest attraction (cult). A rock song like Telegraph Road is not comparable in its complexity with a relatively simple-arranged song in Country or folk style.
If Mark wants to make his old fans sometimes a little pleasure, then he should start on some pieces of the next CD once another bassist (Tony Levin, Pino Palladino or John Illsley). A little more innovation can not hurt anyway.