I believe that the absence of Sultans Of Swing would change the result of the equation, without a doubt, this song is the key to the final result of the immediate success with the band's debut, it is a song that contains elements that brought back the flavor of the old school, a song that talks about musicians and music, styles, environments where bands are playing, terms used by musicians... Anyway, it's a metalinguistic song, made by musicians and for musicians, it brings with it elements in the guitars and drums that are so finely tuned and elegant, and as a bonus, it's sung in Bob Dylan narrative style, this was something that would fill a space and meet a demand that no doubt weren't too into punk, new wave or disco, proving that old school it still made sense in 1977, I don't see The Police (their contemporary) bringing elements with roots in Country, Blues, Rock and Roll, the American sound like Dire Straits had, many people thought it was an American band , because their songs vibrated in such a way. Sultans Of Swing is a daring song in many ways, it took a while to happen in its homeland, but it was an immediate success in Germany, Holland, Australia and the United States, but, one thing that calls my attention is that Dire Straits is a band of musicians that fundamentally attracts musicians, most musicians I know will have something in the Dire Straits catalog that caught their attention, whether it's Mark's guitar guitar, Your Latest Trick's saxophone, or the synthesizers on Walk Of Life and why not quote the Sultans Of Swing drums studio or Alchemy? The songs have so many subtleties that it's always a study when we want to play these songs in character.
But, looking at this video, I really believe that they would get the world's attention with their songs, a song like Down to The Waterline (present in the 1977 demo) has so many interesting things, lyrics and melody attractive, atmospheric, guitar sound, rhythmic and solo are very elegant, in short, it contains signatures in its guitar that will appear in many other songs such as Lady Writer, Tunnel Of Love, Telegraph Road, Calling Elvis.
That's my point of view.