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To what extent can the old connection syntax be deprecated?

Points to consider

Potential action points/TBD

Port uic to generate Qt 5 syntax. That would require to generate QOverload for any function with parameters, but then QOverload would have to be made agnostic of "const QString &" vs "QString") first.
Drop QMetaObject::connectSlotsByName() from uic (option?) or
Change QMetaObject::connectSlotsByName() to output warnings and maybe the connections in C++ so that it can be easily added
Add a per-form setting to Designer so that connectSlotsByName() can be disabled by form for migration?

is required for

QTBUG-71036 Qt Core Changes in Qt 6

relates to

QTCREATORBUG-25164 Add support for "connectslotsbyname" attribute in UI files

resulted in

QTBUG-90308 REG: uic creates ambiguous signal/slot connections

QTBUG-93413 uic and overloaded slots

For Gerrit Dashboard: QTBUG-76375
#	Subject	Branch	Project	Status	CR	V
265152,9	WIP: Add QRelaxedOverload	dev	qt/qtbase	Status: NEW	-2	0
265093,2	WIP: uic: Add option to use Qt connection syntax	dev	qt/qtbase	Status: DEFERRED	-2	0
265316,3	uic: Generate Qt 5 connection syntax for parameter-less connections	dev	qt/qtbase	Status: ABANDONED	0	0
266393,6	QMetaObject::connectSlotsByName(): Add output of connections	5.15	qt/qtbase	Status: MERGED	+2	0
266493,1	WIP: Add QRelaxedOverload	dev	qt/qtbase	Status: ABANDONED	-2	0
266507,6	Qt Designer: Add a setting for calling connectSlotsByName()	dev	qt/qttools	Status: MERGED	+2	0
266524,5	uic: Implement form window setting to disable QObject::connectSlotsByName()	dev	qt/qtbase	Status: MERGED	+2	0
266525,5	uic: Add option to disable the call to QObject::connectSlotsByName()	dev	qt/qtbase	Status: MERGED	+2	0
297557,7	uic: Generate Qt 5 connection syntax	dev	qt/qtbase	Status: MERGED	+2	0
299232,3	uic: Generate string-based connections for custom slots	dev	qt/qtbase	Status: MERGED	+2	0