Yeah I think someone probably would overpay for Trippier and we could improve him with the proceeds but the likes of Lamela Llorente Janssen Wanyama aren't going to bring in significant revenue we also won't replace Toby's quality for 25 million , I'd be loathed to see us sell Eriksen for less than he's worth due to his contract situation , if we keep recycling we are just going to get a little bit worse each year like Woolwich and Southampton, I'll be disappointed if we show no intent to keep our star players and improve the squad this summer.
Aside from the main thrust of the OP....
I'm certainly not blind to the concerns you're highlighting in this post.
Equally, even with an excellent hit-rate, selling 6 to afford 3 of requisite quality will deplete the over-all numbers in no time.
I still think we need to be scouting deeper and harder. If (eg) Zaha (i.e. a player under everyone's noses) is the best we can come up with in an era when 'everyone' wants to be an attacking midfielder then I worry.... You're left paying prime prices every time.... Look where it's getting Utd & Everton right now... Absolutely nowhere.
We're all geared up now for developing players (facilities, synergy/pathway between the age-groups, least of all a manager + crew that have the reputation to match)... Hard to imagine that all gets binned off 'the morning after' the new gaff finally opens.
Spending power alone merely subjects us to the par of the 'wealth league'; having to competed head on with the finances of wealthier teams (See Mancs x 2 before considering those we
can financially gain ground on over the coming years)...... We need that little extra from somewhere else; the same little extra that got us this far.....?
Yeh, shrewd purchases in Hugo, Jan, Eriksen, Toby & Son helped (even then; not 'chicken-feed' to us at the time), but academy and coaching young players provided a massive injection (be that Walker, Rose, Winks, Kane, Dele, Dier, Mason, Bentaleb, Andros bless him or even the likes of Carrol & Alex '9m yet no competitive starts for Spurs' Pritchard.... All helped us bridge the financial gap; some pre-dating Poch himself.
Must admit, I still kinda feel if we end up starting next season with a re-signed and
re-focussed CE/TA; we wouldn't need to spend the earth to crack on. Age is still on the bulk of this squads side and the extent of our injuries this year truly are no myth...
Hopefully, over coming trf windows we can see a utopian blend of 'quality improvements for today' and 'maybes for tomorrow'; but one way or another spending
smartly and progressively is what will keep us competitive if we are to bother the likes of City in the coming years.