[l] is lenited in some languages like English (dark L), and in Polish (Ł). How is [lʲ] developed further if it does?
There is a tendency to develop into a palatal approximant, for instance in Spanish ʎ became ʒ and eventually x; there is also a modern shift of ʎ to j whence ʒ and similar outcomes especially in Latin American Spanish. There is a parallel development in Quechua where earlier [lʲ] as preserved in Cuzco Quechua becomes [ʒ] in Imbabura Quechua. Other languages with the historical change of [ʎ,lʲ] to [j] include Hungarian and French.